div {
	background: url(https://example.com/image.png);
	background: URL(https://example.com/image.png);
	background: \URL(https://example.com/image.png);
	background: url("https://example.com/image.png");
	background: url('https://example.com/image.png');
	background: URL('https://example.com/image.png');
	background: \URL('https://example.com/image.png');
	background: url(data:image/png;base64,iRxVB0);
	background: url(#IDofSVGpath);

	/* A <url-modifier> is either an <ident> or a functional notation. */
	background: url("//aa.com/img.svg" prefetch);
	background: url("//aa.com/img.svg" foo bar baz func(test));
	background: url("http://example.com/image.svg" param(--color var(--primary-color)));

	background: url();
	background: url("");
	background: url('');

	--foo: "http://www.example.com/pinkish.gif";

	background: src("http://www.example.com/pinkish.gif");
	background: SRC("http://www.example.com/pinkish.gif");
	background: src(var(--foo));
	background: url(   https://example.com/image.png   );
	background: u\rl(   https://example.com/image.png   );
	background: url(
	https://example.com/image.png
	);
	background: url(


	https://example.com/image.png


	);
	background: URL(https://example.com/ima\)ge.png);
	background: url(   "https://example.com/image.png"   );
}
